Vulnerability identifier: #VU70915

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-21745

CWE-ID: CWE-300

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Microsoft Exchange Server
Server applications / Mail servers

Vendor: Microsoft

Description

The vulnerability allows a remote user to perform spoofing attack.

The vulnerability exists due to unspecified error. A remote user on the local network can perform spoofing attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2019 Preview 15.02.0196.000 - 2019 CU12 Nov22SU 15.02.1118.020, 2016 Preview 15.01.0225.016 - 2016 CU23 Nov22SU 15.01.2507.016

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-21745

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.